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Author Topic: Nikon D7000  (Read 3373 times)

alangubbay

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Nikon D7000
« on: May 11, 2011, 08:59:25 am »

In the 30 April issue of Amateur Photographer a scientist claims that the new Sony senor in the Nikon D 7000, Sony Alpha and Pentax cameras is not just evolutionary but revolutionary.  He shows a graph which shows read noise with this camera at an ISO setting of 3200 is equivalent to the D3X at 100.  The claim is that it is no longer necessary to set the ISO.  Set the lens aperture and shutter speed and leave the ISO on auto.  I am not too happy about this.  It seems too good to be true!  Any ideas?
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fdisilvestro

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Re: Nikon D7000
« Reply #1 on: May 11, 2011, 10:25:14 am »

This topic has been debated a few times, but yes, if your read noise is always lower than shot noise then ISO could become metadata. You'll have to leave ISO at base ISO, not auto, otherwise you'll gain nothing.

As I see, current Raw converters don't handle this yet. I think it is an easy function to implement, so that the raw data is multiplied by a factor before any processing.

There are cameras like the digital cinema Red cameras, several MFDB that handle ISO as metadata. Also the new Fuji X100 does this at ISO above 1600

BernardLanguillier

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Re: Nikon D7000
« Reply #2 on: May 11, 2011, 05:50:48 pm »

In the 30 April issue of Amateur Photographer a scientist claims that the new Sony senor in the Nikon D 7000, Sony Alpha and Pentax cameras is not just evolutionary but revolutionary. 

Yep, these Sony sensors are one generation ahead of the competition (except perhaps the Nikon D3s sensor).

What is a bit strange though is that Pentax and Nikon appear to be doing a better job at extracting the potential of these marvels than Sony camera themselves. :)

Cheers,
Bernard

Ray

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Re: Nikon D7000
« Reply #3 on: May 12, 2011, 08:02:21 am »

There's one snag to leaving the camera at ISO 100. The LCD review can be too dark to examine the results or show off to another person. In a situation where ISO 3200 would be the correct setting for a bright, correctly exposed appearance on the LCD screen, an ISO setting of 100 is likely to result in an almost totally black review.

But I'm amazed how one click on the 'auto' button in Photoshop can transform that totally black image into something that looks close to being correctly exposed. Everything springs to life as though by magic.

The advantage of leaving the camera at base ISO, and choosing an aperture and a suitable shutter speed in manual mode, is the avoidance of any danger of blown highlights. One can even sometimes retain detail in areas that are normally considered as specral highlights, such as bright lights in the city.
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hjulenissen

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Re: Nikon D7000
« Reply #4 on: May 12, 2011, 08:24:29 am »

I am guessing that a large percentage of D7000 buyers never/seldomly venture into the modes where it is possible to underexpose like this. It may be a feature appreciated by the "more than most people" technically interested users.

-h
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NikoJorj

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Nicolas from Grenoble
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fdisilvestro

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Re: Nikon D7000
« Reply #6 on: May 12, 2011, 09:38:53 am »

There's one snag to leaving the camera at ISO 100. The LCD review can be too dark to examine the results or show off to another person. In a situation where ISO 3200 would be the correct setting for a bright, correctly exposed appearance on the LCD screen, an ISO setting of 100 is likely to result in an almost totally black review.


Yes, but this is a limitation of the current implementation of the in-camera software. This could be easily modified in the future by camera manufacturers, by using ISO as metadata (as in White balance).

hjulenissen

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Re: Nikon D7000
« Reply #7 on: May 12, 2011, 01:22:27 pm »

Yes, but this is a limitation of the current implementation of the in-camera software. This could be easily modified in the future by camera manufacturers, by using ISO as metadata (as in White balance).
That would work only for raw-files, not jpeg.

Is the in-camera preview based on jpeg or raw files?

-h
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fdisilvestro

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Re: Nikon D7000
« Reply #8 on: May 12, 2011, 02:55:28 pm »

That would work only for raw-files, not jpeg.

Is the in-camera preview based on jpeg or raw files?

-h

The preview is usually based on jpeg, but this is not a problem if the software is modified to multiply the raw values by a factor corresponding to the ISO value used (as metadata) before converting to jpeg.

It is actually the same way with the White balance, normally the red and blue channels are multiplied by a factor before converting to jpeg. It can actually be made in a way that only one multiplication is performed, by a factor that adjust for white balance and ISO. Main difference will be the multiplication of the green channel
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